Title: What's GNU
Author: Etienne Suvasa
File: whats-gnu.png
source: https://www.gnu.org/graphics/whats-gnu.png / https://www.gnu.org/graphics/whatsgnu.html
Copyright: Copyright © 1998 Etienne Suvasa
License: Creative Commons Attribution-ShareAlike 4.0 International License
License URI: https://creativecommons.org/licenses/by-sa/4.0/
License Text: https://creativecommons.org/licenses/by-sa/4.0/legalcode
Derivative/Modification:  Yes, "WHTSGNUR.png" is a derivative of Etienne Suvasa's "What's GNU", used under the Creative Commons Attribution-ShareAlike 4.0 International License. "WHTSGNUR.png" is licensed under Creative Commons Attribution-ShareAlike 4.0 International License (http://creativecommons.org/licenses/by-sa/4.0/) by "Goat Avenger" ca. 2022.

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Title: sadgnu2
Author: Nadia Sventsitsky
File: sadgnu2.png
source: https://ninamori.org/static/img/sadgnu2.png / https://www.gnu.org/graphics/sventsitsky-sadgnu.html
Copyright: © 2015 Nadia Sventsitsky
License: Creative Commons Attribution-ShareAlike 4.0 International License
License URI: https://creativecommons.org/licenses/by-sa/4.0/
License Text: https://creativecommons.org/licenses/by-sa/4.0/legalcode
Derivative/Modification: Yes, "NGNURED1.png", "NGNUGRN2.png", "NGNUBLU3.png", NGNUYEL4.png", "NGNUPUR5.png", and "NGNUCYN6.png" are derivatives of Nadia Sventsitsky's "sadgnu2", used under the Creative Commons Attribution-ShareAlike 4.0 International License. "NGNURED1.png", "NGNUGRN2.png", "NGNUBLU3.png", NGNUYEL4.png", "NGNUPUR5.png", and "NGNUCYN6.png" are licensed under Creative Commons Attribution-ShareAlike 4.0 International License (http://creativecommons.org/licenses/by-sa/4.0/) by "Goat Avenger" ca. 2022.

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Title: Milky Way
Author: Jean Beaufort
File: https://www.publicdomainpictures.net/pictures/310000/velka/milky-way-1574617176s6x.jpg
source: https://www.publicdomainpictures.net/en/view-image.php?image=309448&picture=milky-way
Copyright: 
License: https://creativecommons.org/publicdomain/zero/1.0/

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Title: FSFS-title2 (Free Software Free Society)
Author: Jonathan Richard
File: FSFS-title2.jpg
source: https://www.gnu.org/graphics/FSFS-title2.jpg / https://www.gnu.org/graphics/FSFS-logo
Copyright: 
License: https://creativecommons.org/publicdomain/zero/1.0/

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Title: Fractal Wire Art Background
Author: Tanya Hall
File: fractal-wire-art-background.jpg
source: https://www.publicdomainpictures.net/en/view-image.php?image=122232&picture=fractal-wire-art-background
Copyright:
License: CC0 Public Domain
License URI: https://creativecommons.org/publicdomain/zero/1.0/

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Title: Beep 6
Author: Eponn
File: 528866__eponn__beep-6.wav
source: https://freesound.org/people/Eponn/sounds/528866/
Copyright: 
License: https://creativecommons.org/publicdomain/zero/1.0/

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Title: Goat.mp3
Author: Bidone
File: Goat.mp3
source: https://freesound.org/people/Bidone/sounds/66762/
Copyright:
License: http://creativecommons.org/publicdomain/zero/1.0/

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Title: Mt. Fuji
Author: Timecrawler 82
File: Timecrawler 82 - Osaka Lights - 02 Mt. Fuji.ogg
source: https://timecrawler82.bandcamp.com/track/mt-fuji-2
Copyright: © 2018 Timecrawler 82
License: Attribution 3.0 Unported (CC BY 3.0)
License URI: https://creativecommons.org/licenses/by/3.0/
License Text: https://creativecommons.org/licenses/by/3.0/legalcode
Derivative/Modification: Yes, "OLMTFUJI.ogg" is a derivative of Timecrawler 82's "Mt. Fuji" (slightly altered so that looped playback is a bit more seamless), used under the Creative Commons Attribution 3.0 Unported (CC BY 3.0) license. "OLMTFUJI.ogg" is licensed under Creative Commons Attribution-ShareAlike 4.0 International License (http://creativecommons.org/licenses/by-sa/4.0/) by "Goat Avenger" ca. 2022.

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Title: UDMF Experiment
Author: Goat Avenger
File: udmfexp.wad
source: probably somewhere on (https://www.doomworld.com)/(https://www.gamers.org/)
Copyright: © 2022 Goat Avenger
License: Creative Commons Attribution-ShareAlike 4.0 International License
License URI: https://creativecommons.org/licenses/by-sa/4.0/
License Text: https://creativecommons.org/licenses/by-sa/4.0/legalcode
Derivative/Modification: Yes, "UDMF Experiment" (udmfexp.wad) is licensed under Creative Commons Attribution-ShareAlike 4.0 International License by "Goat Avenger."  "UDMF Experiment" (udmfexp.wad) contains and combines modified and unmodified works of the authors listed above in this attribution.txt file, along with original work by "Goat Avenger".  